Checkerwork for hot-blast stoves



,1 J. P. FOLEY I CHECKERWORK FOR HQT BLAST STOVES Filed 1150.29, 1957 2 Sheets-Sheet 1 JOHN P. F045 Patented Dec. 6; 1938 CHECKERWOBK FOR HOT-BLAST STOVES John P. Foley, Lorain, Ohio, assignor to National Tube Company, a corporation of New Jersey Application December 29, 1937, Serial No. 182,323

' 4 Claims. (Cl. 263-51) by the amount of surface ofthe flue defining bricks in contact with the gases passed there through. This can be increased by decreasing the size of such lines with the attendant disadvantages of increasing the cost of the checkerwork since a larger number or bricks are required and also more time is needed to lay them. To overcome this-difliculty the use of inserts in the flues has been resorted to to increase the capacity of the stove. In accordance with the teaching of the present invention, inserts of improved design are provided which greatly increase the capacity of the stove without any change in the general structure thereof.

It is accordingly an objecti 'of the present in- Zfvention to provide a hot-blast stove checkerwork having a greater heat transferring capacity than was heretofore possible;

It is another object of; the ,present invention to increase the capacity jofhot-blast stove checker- 80 work without changing the fundamental structure thereof or increasing its cost.

It is a further objectof the present invention to provide an insert for hot-blast stove checkerwork of improved design and heat exchanging 36 capacity.

A still further object of this invention is'the provision of a checkerwork having the novel constructions, combinations and arrangements'of parts shown in the drawings, to be more particularly-described hereinafter and to be particularly pointed out in the appended claims.

My invention consists in the provision of a refractory checkerwork having a series of vertical passages formed therein with the ends of the 4P bricks of the checkerwork in overlapping or interlocking engagement so as to integrate the structure, and providing in the vertical passages or flues vertically extending superposed cormgated cylindrical inserts which alternately contact opposite sides of the passage or flue to maintain the inserts in superposed position and form a tortuous passageway for the gases passed therethrough.

Referring to the drawings forming part of this I specification:

Figure 1 is a horizontal section showing a hotblast stove having a conventional checkerwork arrangement embodying the inserts of my invention Figure 2 is a fragmentary vertical section of one of the fiues of Figure 1 showing the disposition of the inserts of my invention, therein;

Figure 3 is a horizontal section taken on the line III-IlI of Figure 2;

Figure 4 is a horizontal section on the line IV- -IV of Figure 2; and,

Figure 5 is a perspective view of the checkerwork insert of my invention.

Referring more particularly to the drawings, the numeral 2 designates the cylindrical metal shell of a hot-blast stove which is provided with the usual refractory lining 3. The stove shown has a side combustion chamber 4 and a checkerwork chamber 5 which are formed in the refractory lining 3, a solid wall 6 separating the combustion chamber-'4 from the checkerwork chamber 5. The combustion chamber 4 is provided with a removable lining wall I.

The checkerwork chamber 5 is filled with checkerwork 8 composed of rectangular refractory bricks 9 which are laid in overlapping relation to form a plurality of vertical lines or passages lll. The fiues Ill extend from a point a short distance above the bottom of the stove to a point adjacent but below its top.

Within the vertical flues ill of the. checkerwork 8 are superposed the inserts I! of vmy invention which extend vertically within the ilues Ill and are supported at the lower end of the vertical flues ill in any suitable manner.

The inserts ii are composed of a refractory material or other suitable substance, and are of a generally cylindrical shape with alternate corrugations on two opposing sides. That is, the corrugations, shown at it, do not extend entirely around the inserts so that a portion on either side thereof has a straight surface I! disposed between the corrugations. The alternate cormgations IS on opposite sides of the inserts [5 are such that all transverse cross-sections of the inserts l5 are circular and of equal diameter.

posed at an angle of 90 degrees with respect to-their straight sides I! andcorrugations l6. Thus, although the cross-sectioned area of the opening in the flues ll remains constant through its length, this disposition of the corrugations shifts a portion of this total opening area alternately from one pair of oppositely disposed corners to the other pair of oppositely disposed corners. It will be readily seen that the corrugations ii of the inserts l5 of my invention greatly increase the heating surface of the insert over that of conventional inserts. Moreover, due to the corrugations l6 being placed only on two sides of the inserts i5, and their novel disposition within the flues ll causing a shifting of the flue area or openings, the gas or blast therethrough follows a tortuous path giving a scrubbing eifect to the gas or blast in its passage therethrough. Also, the shafts or wells in each comer are reduced to a minimum and since the cross-sectional area of the openings is kept constant, the possibility of jets of the blast or gas by-passing avail able heating surface is largely eliminated.

While I have shown and described a specific embodiment of my invention, it will be underflues, said inserts having longitudinally extending alternate plain and transversely corrugated wall portions at opposite sides thereof.

2. In a hot-blast stove, checkerwork having vertically extending flues therein and substantially cylindrical superposed inserts within said flues, said inserts having alternate longitudinally extending plain and transversely corrugated wall portions, the successive inserts in said flues having their plain portions in alignment with the corrugated portions of the preceding insert.

3. In a hot-blast stove, checkerwork having vertically extending rectangular flues therein and substantially cylindrical superposed inserts within said flues, said inserts having alternate longitudinally extending plain and transversely corrugated wall portions, the successive inserts contacting alternately the walls of said flues at points adjacent opposite corners of said rectangular flues.

4. In a hot-blast stove, checkerwork having vertically extending square flues therein and su perposed inserts of circular transverse crosssection in said flues, said inserts having alternate longitudinally extending oppositely disposed plain and transversely corrugated wall portions, the

JOHN P. FOLEY. 

